2. Express \( \sigma(\mathrm{t}) \) as a Power series and represent the same in terms of \( \sigma(\gamma, \dot{\gamma}) \). Then show that: \( \sigma(-\gamma, \dot{\gamma})=-\sigma(\gamma,-\dot{\gamma}) \), and \( \sigma(\gamma, \dot{\gamma})=-\sigma(-\gamma,-\dot{\gamma}) \) Then Obtain:
\[
\begin{array}{c}
\sigma_{O E}=\frac{\sigma(\gamma, \dot{\gamma})+\sigma(\gamma,-\dot{\gamma})}{2}=\frac{\sigma(\gamma, \dot{\gamma})-\sigma(-\gamma, \dot{\gamma})}{2} \\
\sigma_{B O}=\frac{\sigma(\gamma, \dot{\gamma})-\sigma(\gamma,-\dot{\gamma})}{2}
\end{array}
\]
